//package OOday01;
//
//public class OverrideDemo {
//    public static void main(String[] args) {
//        Teacher father = new Teacher("牛马",66,"beijing");
//        father.sayHi();
//        Doctor son = new Doctor("狗蛋",66,"提瓦特","呃呃");
//        son.sayHi();
//        Person grandFather = new Person("1",2,"3");
//        grandFather.sayHi();
//    }
//}
